INTACS(RegisteredTM) prescription inserts used to treat patients with Keratoconus as a Humanitarian Use Device

Study ID
STU 012011-115

Cancer Related

Healthy Volunteers

Study Sites

  • Dallas Veteran's Affairs Medical Center
  • UT Southwestern Ambulatory Services

Janie Burroughs

Principal Investigator
Steven Verity


The uS food and Drug administration (FDa) originally approved inTaCS prescription inserts in april 1999 for the correction of low levels of nearsightedness (-1.00 to -3.00 diopters). additional clinical data have shown that inTaCS are safe for the treatment of keratoconus, in July 2004, FDa approved inTaCS inserts for the treatment of keratoconus as a Humanitarian use Device (FDa approval letter attached). The statute and the implementing regulation of FDa (21 CFR 814.124 (aj) require iRB review and approval before a HuD is used.

inTaCS prescription inserts are composed of two clear segments, each having an arc length of 150[Degrees], they are manufactured form a biomedical material called polymethylmethacrylate (PMMa) and are available in three thicknesses. Two inTaCS inserts ranging from 0.250mm to 0.350mm may be implanted depending on the orientation of the cone and the amount of myopia and astigmatism to be reduced.

The inTaCS procedure is typically performed in an outpatient setting. The two tiny inTaCS inserts are surgically placed into the periphery of the cornea through a tiny cut that is made on the cornea after numbing drops have been applied. a specially designed instrument creates a tunnel by separating the tissue layers in the outside periphery of the cornea, the inTaCS inserts are placed into this tunnel where they remain. one or two ophthalmic sutures will be placed to close the incision. a postoperative care information booklet will be given to the patients; patients will be followed by means of postoperative appointments for up to 12 months after the surgery. The visits/testing schedules are listed below:

Participant Eligibility

* Who have experienced a progressive deterioration in their vision, such that they can no longer achieve adequate functional vision on a daily basis with their contact lenses or spectacles;

* Who are 21 years of age or older;

* Who have clear central corneas;

* Who have a corneal thickness of 450 microns or greater at the proposed incision site;

* Who have corneal transplantation as the only remaining option to improve their functional vision.